Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Initialization

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Drivetrain / U881f (automatic Transmission / Transaxle) / Automatic Transaxle System / Initialization

INITIALIZATION

RESET TRANSAXLE COMPENSATION CODE

NOTICE:

  • If the following parts have been replaced, initialize the ECM and perform Reset Memory and Perform Road Test to Allow ECM to Learn.
    • ECM
    • Transmission valve body assembly
    • Shift solenoid valve SL3
    • Shift solenoid valve SL4
    • Shift solenoid valve SL5
  • The transaxle compensation code can only be initialized with the Techstream.

HINT:

The ECM (ECT) memorizes the vehicle conditions when controlling the automatic transaxle assembly and engine assembly.

Therefore, if the automatic transaxle assembly or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information. The reset procedure is as follows:

(a) Make sure the shift lever is in P or N.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Transmission / Utility / A/T Code Reset.

Powertrain > Transmission > Utility

Tester Display

A/T Code Reset

(f) Press "Next" again to proceed.

NOTICE:

After the transaxle compensation code is initialized, perform Reset Memory and Perform Road Test to Allow ECM to Learn.

(g) Press "Exit".

RESET MEMORY

NOTICE:

  • Perform Reset Memory (AT initialization) when replacing the engine assembly.
  • Reset Memory can only be performed with the Techstream.
  • Reset Memory cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal.

HINT:

The ECM (ECT) memorizes the vehicle conditions when controlling the automatic transaxle assembly and engine assembly.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Utility / Reset Memory.

Powertrain > Transmission > Utility

Tester Display

Reset Memory

(e) Press "Next".

NOTICE:

After performing Reset Memory, be sure to perform Perform Road Test to Allow ECM to Learn.

PERFORM ROAD TEST TO ALLOW ECM TO LEARN

CAUTION:

  • Perform the following procedures while strictly observing all traffic laws and speed limits.
  • Do not accelerate or decelerate rapidly.

(a) The Road Test procedure is as follows:

(1) Warm up the engine.

(2) According to the replaced parts, perform the appropriate road test shown below.

Replaced Parts

Road Test
  • Automatic transaxle assembly
  • ECM
  • Transmission valve body assembly
  • Shift solenoid valve SL3
  • Engine assembly

Perform pattern 1, 2 and 3

Pattern 1:*1

  • With the shift lever in D, after gradually accelerating to 50 km/h (31 mph) or more, gradually decelerate to approximately 30 km/h (19 mph).

Pattern 2:

  • When driving at approximately 50 km/h (31 mph) with D4 selected, release the accelerator pedal to allow the vehicle to decelerate gradually to approximately 10 km/h (6 mph).

Pattern 3:*2

  • Accelerate to a speed higher than 50 km/h (31 mph). While gradually decelerating with the shift lever in M and 5th gear selected, downshift to 4th gear at approximately 50 km/h (31 mph), to 3rd gear at approximately 40 km/h (25 mph), and to 2nd gear at approximately 30 km/h (19 mph).
  • Shift solenoid valve SL1
  • Shift solenoid valve SL2
  • Shift solenoid valve SL4
  • Shift solenoid valve SL5

Perform pattern 1 and 3

Pattern 1:*1

  • With the shift lever in D, after gradually accelerating to 50 km/h (31 mph) or more, gradually decelerate to approximately 30 km/h (19 mph).

Pattern 3:*2

  • Accelerate to a speed higher than 50 km/h (31 mph). While gradually decelerating with the shift lever in M and 5th gear selected, downshift to 4th gear at approximately 50 km/h (31 mph), to 3rd gear at approximately 40 km/h (25 mph), and to 2nd gear at approximately 30 km/h (19 mph).

HINT:

  • *1: After gradually accelerating for a distance of approximately 130 m (426.4 ft.) for a period of approximately 15 seconds, gradually decelerate for a distance of approximately 45 m (147.6 ft.) for a period of approximately 5 seconds.
  • *2: Accelerate the vehicle to a speed slightly higher than 50 km/h (31 mph).

    Move the shift lever to M and select 5th gear.

    Release the accelerator pedal and allow the vehicle to decelerate gradually.

    When the vehicle decelerates to approximately 50 km/h (31 mph), downshift to 4th gear.

    When the vehicle decelerates to approximately 40 km/h (25 mph), downshift to 3rd gear.

    When the vehicle decelerates to approximately 30 km/h (19 mph), downshift to 2nd gear.

  • When decelerating, apply the brakes as necessary to adjust the vehicle speed.

NOTICE:

  • *1: The speed, time and distance values are approximate values.
  • *2: After accelerating, deceleration does not need to be performed immediately.
  • *3: There is no specified time or distance.

(3) Repeat the road test until the shift shock and engine speed overrun (engine speed flare when shifting) reach an acceptable level.

NOTICE:

When repeating the acceleration/deceleration cycle of a road test pattern, bring the vehicle to a complete stop before accelerating again.

    Registration
    REGISTRATION CAUTION / NOTICE / HINT NOTICE: When the automatic transaxle is replaced, the transaxle compensation code must be registered to the ECM (proceed to Procedure 1). After the automatic tr ...

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